Download

The aim is to give a demonstration on how to use BGP and understand it in a world of interconnected ISPs. The contents describe practices and techniques about an ISP customer who:
– buys IP transit connectivity from different ISPs.
– needs to implement a load-balancing process.
– inserts redundancy and multihoming options for the Internet provision in case of link failure.

– The first chapter introduces the design of the network and its topology for the study case. You will find diagrams on the BGP and Static design; the traffic engineering targeted configuration, and a listing of IP-addresses and interfaces used.

Notions described:

Chapter A : The second chapter (chapter A) highlights various global notions on BGP, which are a necessity to understand. This is in order to be able to design and configure the network described in this study case, which aims to deliver IP transit services to customer, and uses multihoming connectivity to several ISPs. The general points of BGP in this chapter are related to a way of thinking within an ISP environment. People can overview it, but it is recommended to read it accurately if they do not practice BGP administration every day.

Chapter B: The 3rd chapter (chapter B) targets the design directly and its configuration. Ebgp and Ibgp configurations are described and deeply explained. Peering agreements and multihoming are enlightened in a practical way.

Chapter C: The last chapter (chapter C) validates the configuration of ChapterB, and more generally the study case. Scenarios of links failures are presented, in order to check up if the multihoming configuration agrees the design and the traffic engineering objectives. Moreover, verifications, monitoring and debug commands are also stressed, in order to validate the setup.